wifi: cfg80211: add support for key configuration before association

wifi: cfg80211: add support for key configuration before association

Currently, cfg80211 does not allow key installation, removal, or
modification prior to association in non-AP STA mode. However,
Enhanced Privacy Protection Key Exchange (EPPKE) requires encryption
keys to be managed before association.

Add support to manage keys before association in non-AP STA mode when
the NL80211_EXT_FEATURE_ASSOC_FRAME_ENCRYPTION feature flag is set.
If the flag is not set, reject the encryption keys.

Signed-off-by: Kavita Kavita <kavita.kavita@oss.qualcomm.com>
Link: https://patch.msgid.link/20260114111900.2196941-4-kavita.kavita@oss.qualcomm.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>